Update the stdsimd submodule

Includes some new stabilized intrinsics for the wasm32 target!

Closes #56292

diff --git a/src/stdsimd b/src/stdsimd
index 5e628c5120c619a22799187371f057ec41e06f87..3c0503db8439928e42c1175f0009c506fc874ae9 160000 (submodule)
--- a/src/stdsimd
+++ b/src/stdsimd
@@ -1 +1 @@
-Subproject commit 5e628c5120c619a22799187371f057ec41e06f87
+Subproject commit 3c0503db8439928e42c1175f0009c506fc874ae9